SIEMENS 6ES5 943-7UA11

Siemens SIMATIC S5-115U Central Processing Unit

Description

The 6ES5 943-7UA11 is a CPU 943 module for the Siemens SIMATIC S5-115U PLC system. This central processing unit is a key component for controlling a wide range of industrial automation applications. Despite being an obsolete model, it is highly sought after for spare parts and maintenance of existing, long-running production lines, offering proven reliability and stability. Order now from spareparts2day for expert support and fast delivery.

Specifications

• Manufacturer: Siemens
• Product Family: SIMATIC S5
• System: S5-115U
• Model: CPU 943
• Part Number: 6ES5 943-7UA11
• Program Memory: 8 Kbytes
• Interface: TTY (20mA current loop)

Label Info

• Brand: SIEMENS
• Model: SIMATIC S5 Central Processing Unit
• Part Number: 6ES5 943-7UA11

Application

This CPU is designed for use in the S5-115U programmable logic controller chassis, managing logic, sequencing, timing, counting, and arithmetic operations to control machines and processes. It is ideal for legacy systems in manufacturing, process control, and material handling.

Country of Origin

Made in Germany.

CO2 Impact

Reusing this component saves an estimated 40 kg of CO2 compared to producing a new one. This environmental saving is equivalent to the emissions from driving a standard car for approximately 200 kilometers.

Availability

This item is a tested, used product. Stock is limited due to its obsolete status. Please contact us for current availability.

FAQ

What programming software is required for the S5-115U CPU 943?

This CPU is programmed using Siemens STEP 5 software. Modern software like TIA Portal is not compatible with the SIMATIC S5 series.

Does this CPU require a separate memory module to function?

Yes, the SIMATIC S5 CPUs like the 943 require a separate EPROM or EEPROM memory submodule to be plugged into the front slot to store the user program permanently. The internal RAM is volatile.

What is the communication interface on this CPU 943 (6ES5 943-7UA11)?

This specific model features an integrated TTY (20mA current loop) interface via the DB-15 connector for programming and communication. An appropriate converter is needed to connect to modern PCs (e.g., TTY to USB).

Last Update: Friday, March 13, 2026

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